func getScaledTile(x, y int, scale float64) (scaledTile image.Image, ok bool) {
unscaled, ok := getTile(x, y)
if !ok {
return
}
stiles, ok := scaledTiles[scale]
if !ok {
stiles = map[int]map[int]chan image.Image{}
scaledTiles[scale] = stiles
}
sxtiles, ok := stiles[x]
if !ok {
sxtiles = map[int]chan image.Image{}
stiles[x] = sxtiles
}
scaledTileChan, ok := sxtiles[y]
if !ok {
bounds := unscaled.Bounds()
s := bounds.Size()
scaledTileChan = make(chan image.Image, 1)
go func() {
scaledTileChan <- resize.Resize(unscaled, unscaled.Bounds(), int(.5+float64(s.X)/scale), int(.5+float64(s.Y)/scale))
}()
sxtiles[y] = scaledTileChan
}
select {
case scaledTile = <-scaledTileChan:
scaledTileChan <- scaledTile
default:
ok = false
}
return
}
func Index() error {
// Just a hardcoded path obviously needs to scan directory.
file, err := os.Open("photos/IMG_0128.JPG")
if err != nil {
return err
}
img, err := jpeg.Decode(file)
if err != nil {
return err
}
file.Close()
ratio := 500.0 / float32(img.Bounds().Max.X)
new_height := int(ratio * float32(img.Bounds().Max.Y))
resized := resize.Resize(img, img.Bounds(), 500, new_height)
file, err = os.Create("photos/IMG_0128_THUMB.JPG")
if err != nil {
return err
}
jpeg.Encode(file, resized, &jpeg.Options{Quality: 100})
file.Close()
return nil
}
func window() {
var wg sync.WaitGroup
size := 500
wg.Add(1)
go func() {
dw, err := wde.NewWindow(size, size)
if err != nil {
fmt.Println(err)
return
}
dw.SetTitle("xkcd-zoom")
dw.SetSize(size, size)
dw.Show()
events := dw.EventChan()
const (
Draw = 1
Redraw = 2
ScaleInPlace = 3
)
redraw := make(chan int, 1)
redraw <- Draw
done := make(chan bool)
go func() {
for {
time.Sleep(time.Second)
redraw <- Redraw
}
}()
go func() {
loop:
for ei := range events {
redrawType := 0
runtime.Gosched()
switch e := ei.(type) {
case wde.MouseDownEvent:
case wde.MouseDraggedEvent:
switch e.Which {
case wde.LeftButton:
changedx := e.Where.X - e.From.X
changedy := e.Where.Y - e.From.Y
drawx += float64(changedx) * scale
drawy += float64(-changedy) * scale
redrawType = Draw
case wde.RightButton:
changedy := e.From.Y - e.Where.Y
mouseScale := float64(changedy) / 100
scale *= math.Pow(2, mouseScale)
redrawType = ScaleInPlace
}
case wde.MouseUpEvent:
if e.Which == wde.RightButton {
scaledTiles = map[float64]map[int]map[int]chan image.Image{}
redrawType = Draw
}
case wde.KeyTypedEvent:
if e.Key == wde.KeyEscape {
break loop
}
case wde.CloseEvent:
break loop
case wde.ResizeEvent:
redrawType = Draw
}
if redrawType != 0 {
select {
case redraw <- redrawType:
default:
}
}
}
dw.Close()
done <- true
}()
var greyBack, screenBuffer *image.RGBA
var grey = color.RGBA{155, 155, 155, 255}
var bufferScale = scale
var lastRedraw int
for {
select {
case redrawType := <-redraw:
if lastRedraw == ScaleInPlace && redrawType == Redraw {
continue
}
lastRedraw = redrawType
s := dw.Screen()
if redrawType == Draw || redrawType == Redraw {
width, height := dw.Size()
tilesh := int(float64(width)/(float64(imageWidth)/scale) + 1)
tilesv := int(float64(height)/(float64(imageHeight)/scale) + 1)
tilecx := drawx / imageWidth
tilecy := drawy / imageHeight
tileMinX := int(-tilecx) - tilesh - 1
tileMinY := int(-tilecy) - tilesv - 1
tileMaxX := int(-tilecx) + tilesh + 1
tileMaxY := int(-tilecy) + tilesv + 1
if greyBack == nil || s.Bounds() != greyBack.Bounds() {
bounds := s.Bounds()
greyBack = image.NewRGBA(bounds)
for x := bounds.Min.X; x <= bounds.Max.X; x++ {
for y := bounds.Min.Y; y <= bounds.Max.Y; y++ {
greyBack.SetRGBA(x, y, grey)
}
}
screenBuffer = image.NewRGBA(bounds)
}
draw.Draw(screenBuffer, screenBuffer.Bounds(), greyBack, image.Point{0, 0}, draw.Src)
for tilex := tileMinX; tilex <= tileMaxX; tilex++ {
for tiley := tileMinY; tiley <= tileMaxY; tiley++ {
scaledTile, ok := getScaledTile(tilex, tiley, scale)
if !ok || scaledTile == nil {
continue
}
dx, dy := mapToScreen(width, height, float64(tilex)*imageWidth, float64(tiley)*imageHeight)
drawRect := scaledTile.Bounds()
drawRect.Min.X += dx
drawRect.Min.Y -= dy
drawRect.Max.X += dx
drawRect.Max.Y -= dy
draw.Draw(screenBuffer, drawRect, scaledTile, image.Point{0, 0}, draw.Src)
}
}
bufferScale = scale
if xs, ok := s.(*xgraphics.Image); ok {
copyToXGraphicsImage(xs, screenBuffer)
} else {
draw.Draw(s, s.Bounds(), screenBuffer, image.Point{0, 0}, draw.Src)
}
} else if redrawType == ScaleInPlace {
scaleFactor := scale / bufferScale
bufBounds := screenBuffer.Bounds()
width := bufBounds.Max.X - bufBounds.Min.X
height := bufBounds.Max.Y - bufBounds.Min.Y
if scaleFactor < 1 {
widthDiff := width - int(float64(width)*scaleFactor)
heightDiff := height - int(float64(height)*scaleFactor)
//bufBounds.Min.X += widthDiff / 2
bufBounds.Max.X -= widthDiff
//bufBounds.Min.Y += heightDiff / 2
bufBounds.Max.Y -= heightDiff
subBuffer := screenBuffer.SubImage(bufBounds)
scaledBuffer := resize.Resize(subBuffer, subBuffer.Bounds(), width, height).(*image.RGBA)
if xs, ok := s.(*xgraphics.Image); ok {
copyToXGraphicsImage(xs, scaledBuffer)
} else {
draw.Draw(s, s.Bounds(), scaledBuffer, image.Point{0, 0}, draw.Src)
}
}
if scaleFactor > 1 {
scaleFactor = 1 / scaleFactor
newWidth := int(float64(width) * scaleFactor)
newHeight := int(float64(height) * scaleFactor)
scaledBuffer := resize.Resize(screenBuffer, screenBuffer.Bounds(), newWidth, newHeight).(*image.RGBA)
if xs, ok := s.(*xgraphics.Image); ok {
copyToXGraphicsImage(xs, scaledBuffer)
} else {
draw.Draw(s, s.Bounds(), scaledBuffer, image.Point{0, 0}, draw.Src)
}
}
}
dw.FlushImage()
case <-done:
wg.Done()
return
}
}
}()
wg.Wait()
wde.Stop()
}
